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Spontaneity

Spontaneity

Chemistry & Chemical Reactivity
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter18: Principles Of Chemical Reactivity: Entropy And Free Energy
Section: Chapter Questions
Problem 49PS
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The reaction between hydrazine and dinitrogen tetroxide in their liquid forms is used to propel rockets into the air. Calculate the ∆H°, ∆S° and ∆G°. Is the reaction spontaneous at standard conditions? N2H4 (l) + N2O4 (l) = N2 (g) + H2O (g) molar ratio of the balanced chemical equation: ? Substance / S° (J/mol • K) N2H4 (l) / 121.21 N2O4 (l) / 209.24 N2 (g) / 191.50 H2O (g) / 188.72 ∑S° (product) = ? ∑S° (reactant) = ? ∆S° rxn = ? Substance / H° (kJ/mol) N2H4 (l) / 50.63 N2O4 (l) / -19.58 N2 (g) / 0 H2O (g) / -241.82 ∑H° (product) = ? ∑H° (reactant) = ? ∆H° rxn = ? in KJ T in Kelvin = ? ∆S (surr) = ? ∆S (universe) = ? ∆G = ? Spontaneity (S for spontaneous and NS for non-spontaneous): ?
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